13+2f=21

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Solution for 13+2f=21 equation: 



13+2f=21

We move all terms to the left:

13+2f-(21)=0

We add all the numbers together, and all the variables

2f-8=0

We move all terms containing f to the left, all other terms to the right

2f=8

f=8/2

f=4

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